Made escape sequence handling stricter: no longer supporting arbitrary

characters, only special escapes like \n, hex sequences like \x0a, octal
sequences like \012, and backslashes \\

1 files changed, 3 insertions, 1 deletions

diff --git a/pattern.c b/pattern.c
index 91b9351..32b1376 100644
--- a/pattern.c
+++ b/pattern.c
@@ -306,9 +306,11 @@ static pat_t *_bp_simplepattern(file_t *f, const char *str)
 
                 const char *opstart = str;
                 unsigned char e = (unsigned char)unescapechar(str, &str);
+                if (str == opstart)
+                    file_err(f, start, str, "This isn't a valid escape sequence.");
                 if (matchchar(&str, '-')) { // Escape range (e.g. \x00-\xFF)
                     if (next_char(f, str) != str+1)
-                        file_err(f, start, next_char(f, str), "Sorry, UTF8 escape sequences are not supported.");
+                        file_err(f, start, next_char(f, str), "Sorry, UTF8 escape sequences are not supported in ranges.");
                     const char *seqstart = str;
                     unsigned char e2 = (unsigned char)unescapechar(str, &str);
                     if (str == seqstart)